how to sort array in php? [duplicate] - php

Question

This question already has answers here:
Sort array by two specifics values in PHP
(2 answers)
Closed 9 years ago.
I have data like this in mysql sort by id ASC:
NOTE: total is not in mysql, total is from price * total_item -> for example
id name total
---- ----------- ----------
1 item1 3
2 item2 5
3 item3 1
4 item4 2
5 item5 4
and I want to sort it in php
first, I sort the total to get the highest total in first place
//insert total into list
for($i=0;$i<5;$i++){
$total_list[] = $total;
$b = $total_list;
rsort($b);
//display total from highest to lowest
echo $b[$i];
}
the result will be like this:
id name total
---- ----------- ----------
1 item1 5
2 item2 4
3 item3 3
4 item4 2
5 item5 1
ok, I already got the total sorted according to my code above
so to get the name sorted too, I have to sort it but I already tried the same way as I sorted the total but the result is different
nah, I want the result is like this
id name total
---- ----------- ----------
1 item2 5
2 item5 4
3 item1 3
4 item4 2
5 item3 1

Answer 1

This can (and should) all be done from the SQL query; something like:
SELECT `id`, `name`, `price` * `total_item` AS `total`
FROM `mytable`
ORDER BY
`price` * `total_item` DESC,
`id` ASC
When ORDERing, you can't use the name given in AS, but you can order on the same calculation.

Answer 2

I tried something like this: using asort
$data = array(
"item1"=>"1",
"item2"=>"2",
"item3"=>"5",
"item4"=>"3",
"item5"=>"4"
);
asort($data);
print_r($data);
Resut: Array ( [item1] => 1 [item2] => 2 [item4] => 3 [item5] => 4 [item3] => 5 )
In order to obtain the highest total value and name, get the last element on the array. Though you can manipulate the names and keys by using foreach.
If we add foreach like this:
foreach($data as $key=>$val){
echo "Name:".$key." Total:".$val."<br>";
}
Result:
Name:item1 Total:1
Name:item2 Total:2
Name:item4 Total:3
Name:item5 Total:4
Name:item3 Total:5